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High-statistics study of neutral-pion pair production in two-photon collisions
- Authors
- Uehara, S.; Watanabe, Y.; Nakazawa, H.; Aihara, H.; Arinstein, K.; Aulchenko, V.; Bakich, A. M.; Barberio, E.; Belous, K.; Bhardwaj, V.; Bondar, A.; Bozek, A.; Bracko, M.; Browder, T. E.; Chen, A.; Cheon, B. G.; Chistov, R.; Cho, I. -S.; Choi, S. -K.; Choi, Y.; Dash, M.; Eidelman, S.; Epifanov, D.; Gabyshev, N.; Goldenzweig, P.; Ha, H.; Haba, J.; Han, B. -Y.; Hayasaka, K.; Hayashii, H.; Hazumi, M.; Hoshi, Y.; Hou, W. -S.; Hyun, H. J.; Inami, K.; Ishikawa, A.; Iwasaki, Y.; Joshi, N. J.; Kah, D. H.; Katayama, N.; Kawasaki, T.; Kichimi, H.; Kim, H. O.; Kim, Y. I.; Kim, Y. J.; Korpar, S.; Krizan, P.; Krokovny, P.; Kuzmin, A.; Kwon, Y. -J.; Lee, M. J.; Lesiak, T.; Liu, Y.; Liventsev, D.; Louvot, R.; McOnie, S.; Miyata, H.; Mizuk, R.; Nagasaka, Y.; Nakao, M.; Nishida, S.; Nishimura, K.; Nitoh, O.; Ogawa, S.; Ohshima, T.; Okuno, S.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Park, H.; Park, H. K.; Pestotnik, R.; Piilonen, L. E.; Poluektov, A.; Sahoo, H.; Sakai, Y.; Schneider, O.; Senyo, K.; Shapkin, M.; Shiu, J. -G.; Shwartz, B.; Staric, M.; Sumiyoshi, T.; Tanaka, M.; Teramoto, Y.; Tikhomirov, I.; Uglov, T.; Unno, Y.; Uno, S.; Usov, Y.; Varner, G.; Vervink, K.; Vinokurova, A.; Wang, C. H.; Wang, P.; Yabsley, B. D.; Yamashita, Y.; Zhang, C. C.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zivko, T.; Zupanc, A.; Zyukova, O.
- Issue Date
- Mar-2009
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW D, v.79, no.5, pp.1 - 13
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW D
- Volume
- 79
- Number
- 5
- Start Page
- 1
- End Page
- 13
- ISSN
- 1550-7998
- Abstract
- The differential cross sections for the process gamma gamma -> pi(0)pi(0) have been measured in the kinematic range 0.6 GeV < W < 4.1 GeV, vertical bar cos theta* vertical bar < 0.8 in energy and pion scattering angle, respectively, in the gamma gamma center-of-mass system. The results are based on a 223 fb(-1) data sample collected with the Belle detector at the KEKB e(+)e(-) collider. The differential cross sections are fitted in the energy region 1.7 GeV < W < 2.5 GeV to confirm the two-photon production of two pions in the G wave. In the higher-energy region, we observe production of the chi(c0) charmonium state and obtain the product of its two-photon decay width and branching fraction to pi(0)pi(0). We also compare the observed angular dependence and ratios of cross sections for neutral-pion and charged-pion pair production to QCD models. The energy and angular dependence above 3.1 GeV are compatible with those measured in the pi(+)pi(-) channel, and in addition we find that the cross section ratio, sigma(pi(0)pi(0))/sigma(pi(+)pi(-)), is 0.32 +/- 0.03 +/- 0.05 on average in the 3.1-4.1 GeV region.
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Related Researcher
- Cheon, Byung Gu
- COLLEGE OF NATURAL SCIENCES (DEPARTMENT OF PHYSICS)